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Finding the Fourth Proportional to 51.28, 70.64 and 42.48

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Solution

The fourth proportional to 51.28, 70.64 and 42.48 is: 58.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.28 : 70.64 = 42.48 : x
  2. Step 2: Convert to fraction form
    51.28/70.64 = 42.48/x
  3. Step 3: Cross multiply
    51.28x = 70.64 × 42.48
  4. Step 4: Simplify right side
    51.28x = 3,000.79
  5. Step 5: Solve for x
    x = 3,000.79/51.28
  6. Step 6: Final answer
    x = 58.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.